html {
  box-sizing: border-box;
  font-size: 62.5%;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: inherit;
}
*:before, *:after {
  box-sizing: inherit;
}

body {
  width: 100%;
  height: 100vh;
  background-color: black;
  font-family: sans-serif;
}

.light {
  background: linear-gradient(#b2b2b2, #1f1f1f);
  width: 240px;
  height: 30px;
  position: absolute;
  margin-top: -15px;
  margin-left: -100px;
  top: 50%;
  left: 50%;
  border-radius: 5px;
  animation: burn-out 2s infinite;
}
.light::before {
  content: "";
  position: absolute;
  width: 200px;
  height: 30px;
  top: 0;
  left: 20px;
  background-color: white;
  box-shadow: 0 0 120px 15px white;
}

@keyframes burn-out {
  3% {
    opacity: 1;
  }
  6% {
    opacity: 0;
  }
  9% {
    opacity: 1;
  }
  12% {
    opacity: 0;
  }
  15% {
    opacity: 1;
  }
  18% {
    opacity: 0;
  }
  21% {
    opacity: 1;
  }
  24% {
    opacity: 0;
  }
  25%, 57%, 60%, 70%, 97% {
    opacity: 0.1;
  }
  63%, 100% {
    opacity: 1;
  }
}
.polygon {
  width: 300px;
  height: 300px;
  background: url("https://picsum.photos/id/1002/400/300") no-repeat;
  background-size: cover;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 70%;
  -webkit-clip-path: polygon(50% 0%,93.3012701892% 75%,6.6987298108% 75%);
          clip-path: polygon(50% 0%,93.3012701892% 75%,6.6987298108% 75%);
}